ppc: Support little endian intreadwrite
[libav.git] / libavutil / ppc / intreadwrite.h
1 /*
2 * Copyright (c) 2008 Mans Rullgard <mans@mansr.com>
3 *
4 * This file is part of Libav.
5 *
6 * Libav is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * Libav is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with Libav; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 #ifndef AVUTIL_PPC_INTREADWRITE_H
22 #define AVUTIL_PPC_INTREADWRITE_H
23
24 #include <stdint.h>
25 #include "config.h"
26
27 /*
28 * -O0 would compile the packed struct version, which is used by
29 * default, in an overly verbose fashion, so we override it here.
30 */
31 #if HAVE_BIGENDIAN
32 #define AV_RB64(p) (*(const uint64_t *)(p))
33 #define AV_WB64(p, v) (*(uint64_t *)(p) = (v))
34
35 #else
36 #define AV_RL64(p) (*(const uint64_t *)(p))
37 #define AV_WL64(p, v) (*(uint64_t *)(p) = (v))
38
39 #endif
40
41 #if HAVE_XFORM_ASM
42
43 #if HAVE_BIGENDIAN
44 #define AV_RL16 av_read_bswap16
45 #define AV_WL16 av_write_bswap16
46 #define AV_RL32 av_read_bswap32
47 #define AV_WL32 av_write_bswap32
48 #define AV_RL64 av_read_bswap64
49 #define AV_WL64 av_write_bswap64
50
51 #else
52 #define AV_RB16 av_read_bswap16
53 #define AV_WB16 av_write_bswap16
54 #define AV_RB32 av_read_bswap32
55 #define AV_WB32 av_write_bswap32
56 #define AV_RB64 av_read_bswap64
57 #define AV_WB64 av_write_bswap64
58
59 #endif
60
61 static av_always_inline uint16_t av_read_bswap16(const void *p)
62 {
63 uint16_t v;
64 __asm__ ("lhbrx %0, %y1" : "=r"(v) : "Z"(*(const uint16_t*)p));
65 return v;
66 }
67
68 static av_always_inline void av_write_bswap16(void *p, uint16_t v)
69 {
70 __asm__ ("sthbrx %1, %y0" : "=Z"(*(uint16_t*)p) : "r"(v));
71 }
72
73 static av_always_inline uint32_t av_read_bswap32(const void *p)
74 {
75 uint32_t v;
76 __asm__ ("lwbrx %0, %y1" : "=r"(v) : "Z"(*(const uint32_t*)p));
77 return v;
78 }
79
80 static av_always_inline void av_write_bswap32(void *p, uint32_t v)
81 {
82 __asm__ ("stwbrx %1, %y0" : "=Z"(*(uint32_t*)p) : "r"(v));
83 }
84
85 #if HAVE_LDBRX
86
87 static av_always_inline uint64_t av_read_bswap64(const void *p)
88 {
89 uint64_t v;
90 __asm__ ("ldbrx %0, %y1" : "=r"(v) : "Z"(*(const uint64_t*)p));
91 return v;
92 }
93
94 static av_always_inline void av_write_bswap64(void *p, uint64_t v)
95 {
96 __asm__ ("stdbrx %1, %y0" : "=Z"(*(uint64_t*)p) : "r"(v));
97 }
98
99 #else
100
101 static av_always_inline uint64_t av_read_bswap64(const void *p)
102 {
103 union { uint64_t v; uint32_t hl[2]; } v;
104 __asm__ ("lwbrx %0, %y2 \n\t"
105 "lwbrx %1, %y3 \n\t"
106 : "=&r"(v.hl[1]), "=r"(v.hl[0])
107 : "Z"(*(const uint32_t*)p), "Z"(*((const uint32_t*)p+1)));
108 return v.v;
109 }
110
111 static av_always_inline void av_write_bswap64(void *p, uint64_t v)
112 {
113 union { uint64_t v; uint32_t hl[2]; } vv = { v };
114 __asm__ ("stwbrx %2, %y0 \n\t"
115 "stwbrx %3, %y1 \n\t"
116 : "=Z"(*(uint32_t*)p), "=Z"(*((uint32_t*)p+1))
117 : "r"(vv.hl[1]), "r"(vv.hl[0]));
118 }
119
120 #endif /* HAVE_LDBRX */
121
122 #endif /* HAVE_XFORM_ASM */
123
124 #endif /* AVUTIL_PPC_INTREADWRITE_H */